Send push notifications using Java. 
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The org.singr.PushNotification class represents push notifications you want to send to an Apple mobile device via the Push Notifications application (http://www.appnotifications.com/). The class uses the application's public HTTP API. 

Construct a message using one of the constructors and add properties via the provided setters. For sounds and a message's urgency, you must use the provided enums, PushNotification.Sound and PushNotification.Urgency, respectively. 

To send a message, call one of the send methods. One takes an API key, the other one takes a user's email address and password to resolve the API key itself before sending. Resolved API keys are cached. The cache is local to a JVM instance. 

There is no limit on sending a single PushNotification instance. You could, e.g., construct a notification and loop over a list of API keys to send the same notification to a list of users. 

To just retrieve the API key for a user, use the resolveApiKey method. The API key for a user can also be found in the API section of the Push Notifications website (http://www.appnotifications.com/account/rest_api). 

Receivers of push notifications must have the Push Notifications application installed. 

(c) Leif Singer, June 4th 2010

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